禁用文本区域中的某些特殊字符 [英] Disabling some special characters in text area

问题描述

嘿伙计们，我正在考虑如何禁止用户输入一些特殊字符，例如<和>。但我希望他们使用句号，逗号和问号以及惊叹号和引号。我已经提出了这段代码，但它似乎不允许任何特殊字符。：

Hey guys, I'm thinking of ways to disable users from typing some special characters like < and >. But I would like them to use full stops and commas and question marks and exclamation marks and quotes. I've come up with this piece of code but it doesn't seem to allow any special character.:

<script type="text/JavaScript">
function valid(f) {
!(/^[A-zÑñ0-9]*$/i).test(f.value)?f.value = f.value.replace(/[^A-zÑñ0-9]/ig,''):null;
} 
</script>

推荐答案

试试这个......

Try with this...

var iChars = "!@#$%^&*()+=-[]\\\';,./{}|\":<>?";

  for (var i = 0; i < document.formname.fieldname.value.length; i++) {
    if (iChars.indexOf(document.formname.fieldname.value.charAt(i)) != -1) {
    alert ("Your username has special characters. \nThese are not allowed.\n Please remove them and try again.");
    return false;
    }
  }

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